The dry heart of Chinese cabbage is also known as Jiao edge and sandwich skin. In recent years, the incidence rate has increased year by year, resulting in severely reduced Chinese cabbage production and reduced food quality. At present, Chinese cabbage is in the stage of rosette to Baoxin, which is a crucial period for the prevention and cure of Chinese cabbage's dry heartburn. Therefore, the majority of vegetable growers should pay close attention to prevention and treatment.
First, the symptoms
The disease mainly occurs in the rosette stage and ball stage. During the rosette period, the edges of the new leaves are dry and the inward curling growth is inhibited. The early sensation of senescence, the edge of the leaf blade was immersed in water, translucent, pale yellow to yellowish brown, and the leaf shrinked into a white dry zone. After the onset of the ball, the appearance was normal. After the cut, the leaves were seen to have coke and the leaves could still grow. However, the ball was not tight, and some were rotted due to bacterial infestation.
Second, the cause of the disease
In the past, more studies suggested that the disease was caused by lack of water-soluble calcium in the soil and malnutrition. Existing reports suggest that it is caused by the lack of effective manganese. Therefore, a serious lack of soluble manganese in the soil is the main cause of dry heartburn in Chinese cabbage.
Third, control methods
1. Reasonably apply nitrogen, increase boron and zinc fertilizers and phosphorus and potassium fertilizers. In the rosette stage, the ball stage combined with watering each fertilizer once. Apply 3 kg of nitrogen fertilizer (6.5 kg of urea) and 1-2 kg of boron and zinc fertilizer per acre, and spray 0.2% potassium dihydrogen phosphate 1-2 times during the rosette and ball stage.
2, spray calcium manganese fertilizer and naphthalene acetic acid. The dry heart was found to be immediately watered and sprayed with a mixture of 0.7% calcium chloride and 50 mg/kg of nicosic acid, or a 1% solution of superphosphate or a 0.7% solution of manganese sulfate, at a rate of 50 liters of water per acre. % - 10%.
3. Guarantee the water supply during the rosette and ball stage. The lack of water in the soil is likely to cause dry heartburn. Water shortages during the period of nesting and the ball-breaking period must be promptly watered. It is forbidden to pour industrial waste water.
4, storage of cabbage should maintain 0 °C, humidity 90% -95%, reduce the incidence of dry heartburn.
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